Er4 Al4 O12

Er₄Al₄O₁₂ is a rare-earth aluminum oxide ceramic compound combining erbium (a lanthanide element) with alumina in a mixed-oxide crystal structure. This material belongs to the family of rare-earth ceramics and is primarily of research and development interest rather than established commercial production, with potential applications in high-temperature refractory systems, optical devices, and advanced ceramic matrices where rare-earth doping enhances thermal stability or luminescent properties.